Hello, I've been trying to manage interactive traffic with HTB [v.2]. I prepared proper classes hierarchy with extra bandwidth and high priority for interactive. I tried two variants: one "classic" with root qdisc and class hierarchy and second with: root_qdisc->rated_class->parent_qdisc->class_hierarchy as is described in HTB manul in section "6. Priorizing bandwidth share": # qdisc for delay simulation tc qdisc add dev eth0 root handle 100: htb tc class add dev eth0 parent 100: classid 100:1 htb rate 90kbps # real measured qdisc tc qdisc add dev eth0 parent 100:1 handle 1: htb AC="tc class add dev eth0 parent" $AC 1: classid 1:1 htb rate 100kbps $AC 1:2 classid 1:10 htb rate 50kbps ceil 100kbps prio 1 $AC 1:2 classid 1:11 htb rate 50kbps ceil 100kbps prio 1 I also attached extra classes on external outgoing interface like have been described in wondershaper scrip. I can see that it works somehow but its not ideal. I tried to check how does it work with filtering ICMP traffic to interactive class and pinging my gateway. When bandwidth wasn't saturated Round Trip Time of course was low [~4ms] but when becomes congested average RTT raised to 100 sometimes to 200ms and was very jittered [jumping from 6 to 400ms]. 1) I have a question about it, why it doesnt work in so manner, why RTT isn't always as low as 4ms ie. ? Is it due to reaction time of shaped traffic - time when traffic have been downgraded from initial max. to some shaped band. to have some space for interactive band ? Or maybe is it performance issue ? In my class setup, I limited parent class to 90% of total avialable band. [925Kbits for 1MBit line] to have some space for bursts and to avoid 100% saturation and raise performance of interactive traffic. 2) question. What about setup described in "6. Priorizing bandwidth share" ? Could somebody explain me what is a purpose of rated class [line B] and attached to it second qdisc [line C], how works this delay simulation, why not to use "classic" setup ? If it really have something to do how to compute that rate of "root" class [line B]? # qdisc for delay simulation line A) tc qdisc add dev eth0 root handle 100: htb line B) tc class add dev eth0 parent 100: classid 100:1 htb rate 90kbps # real measured qdisc line C) tc qdisc add dev eth0 parent 100:1 handle 1: htb AC="tc class add dev eth0 parent" line D)$AC 1: classid 1:1 htb rate 100kbps Regards tw -- ---------------- ck.eter.tym.pl "Never let shooling disturb Your education" _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
